That solved it! Thanks, Nikhil!
Eric
-----Original Message-----
From: pgsql-odbc-owner@postgresql.org [mailto:pgsql-odbc-owner@postgresql.org] On Behalf Of Nikhil Deshpande
Sent: Friday, December 05, 2014 2:02 PM
To: pgsql-odbc@postgresql.org
Subject: Re: [ODBC] SQLFreeHandle() takes eons when running debug
On 12/5/14 10:56 AM, Eric Hill wrote:
> Not sure how this could be the PostgreSQL ODBC driver's fault, but
> when I run a debug build of my application, calls to SQLFreeHandle()
> to free a statement can have for quite a long time (we're talking a
> minute or
> two) before proceeding. This is Windows, 64-bit Unicode, version
> 9.03.03 of the PG ODBC driver. The call stack looks like this when paused:
>
> ntdll.dll!RtlCompareMemoryUlong() + 0x10 bytes
>
> ntdll.dll!RtlpFreeHeap() + 0x113f bytes
>
> ntdll.dll!RtlFreeHeap() + 0x1df bytes
>
> ntdll.dll!RtlDebugFreeHeap() + 0x23f bytes
>
> ntdll.dll!RtlpFreeHeap() + 0x7d5b7 bytes
>
> ntdll.dll!RtlFreeHeap() + 0x1df bytes
>
> msvcr100.dll!free() + 0x1c bytes
>
> psqlodbc35w.dll!00007ff97bc7c827()
>
> [Frames below may be incorrect and/or missing, no
> symbols loaded for psqlodbc35w.dll]
>
> psqlodbc35w.dll!00007ff97bc7656b()
>
> psqlodbc35w.dll!00007ff97bc76044()
>
> psqlodbc35w.dll!00007ff97bc761c7()
>
> psqlodbc35w.dll!00007ff97bc88781()
>
> psqlodbc35w.dll!00007ff97bc66bda()
>
> odbc32.dll!FreeStmt() + 0x2c5 bytes
>
> odbc32.dll!SQLFreeHandle() + 0x2a0 bytes
>
> > Jmp.exe!DBContext::freeStmt(void * &
> hstmt=0x000000001f032030) Line 1644 + 0x14 bytes C++
>
> Running a release build, no such delay. We don't see anything like
> this for SQL Server, Oracle, DB2, Teradata, or MySQL ODBC drivers.
> Anyone run into this before that can suggest a fix or workaround?
Perhaps this might be relevant (setting _NO_DEBUG_HEAP=1 env var to skip heap validation):
http://stackoverflow.com/a/18753164
Thanks,
Nikhil
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